Calculating- machine



April 1 1931- E. F. BRITTEN, JR 1,801,902

CALCULATING MACHINE Filed Dec. 23, 1929 3 Sheets-Sheet 1 \h 0 69 N R. P

z g J 4E 31 Q N vApril 21, 1931.

E. F. BRITTEN. JR

CALCULATING MACHINE Filed Dec. 23, 1929 3 Sheets-Sheet 2 April 21, 1931. E. F. BRITTEN LJR CALCULATING MACHINE Filed Dec. 23, 1929 3 Sheets-Sheet 5 Patented Apr. 21, 1931 UNITED STATES PATENT OFFICE EDWIN BRITTEN, 53., OF MAPLEWOOD, NEXV JERSEY, ASSIGNOR TO MONROE CAL- CULATING MACHINE COMPANY, OF ORANGE, NEW JERSEY, A CORPORATION OF DELAWARE CALCULATING MACHINE Application filed December 23, 1929. Serial No. 415,976.

The invention relates to power means for shifting the numeral wheel carriage of a calculating machine selectively toward the right or the left, following either an additive or asubtractive cycle of operation,in response to the previous setting of a suitable control member, said control member being provided with a third or neutral position, as will hereinafter be described.

The invention consists in the novel con- ,struction and combination of parts, as set forth in the appended claims.

In the accompanying drawings, illustrating the invention:

Figure 1 is a plan View of a calculating machine, embodying the invention and showing the shift control knob.

Fig. 2 is a left hand elevation of the shifting mechanism parts.

ig. 3 is a detail plan view showing, in their neutral position, the parts used to engage and disengage the carriage-shifting clutches.

Fig. 4 is a view similar to Fig. 3 but show-. ing the parts in a position to perform a righthand shift of the numeral wheel carriage.

Fig. 5 is also' a similar view toFig. 3 but shows the parts in a position to perform a left-hand shift of the numeral wheel carriage.

Fig. 6 is a detail front elevation of the parts associated with the carriage-shifting shaft, said parts being shown in a position taken during a shifting operation.

These drawings illustrate the invention as applied to a Monroe calculating machine, such as the machine disclosed in the United States patent to George C. Chase, Number 1,566,650, issued December 22, 1925.

As viewed in Fig. 3, the carriage-shifting clutch members 61are held in a neutral posisaid shipper arms having a plate 65 held under the influence of spring 316 against a pawl 318. Pawl 318 is pivotally mounted at 319 to a spur 3. .1 of lever 301 and is held rigid by means of pins 320 and 330, in a lever 321, said lever 321 being pivotally mounted to the under side of the top keyboard plate at 322 41nd held 'by means of a click 323 engaging pin 326 acting in said slot 327 will cam lever 321 in a counter-clockwise direction about point 322, until latched by click mem ber 323 entering the right-hand notch of lever 321 as viewed in Fig. 4. Rotation of lever 321 about point- 322 has caused pin 320 of said lever to engage the edge of pawl 318 and pivot the pawl about point 319, whereupon arm 328, of pawl 318, contacts with plate 65 to force same forward against tension of spring 316, and shipper arm 317 Will bring clutch member 61 into engagement with the clutch member 62 to rotate the carriageshifting shaft in a clockwise direction, under the power impulse to be described.

It will be noted that, if the stop member 25 described in the Chase Patent Number 1,566,- 650 is released from the restraint of trigger 31 (Fig. 2) with the parts in .normal pos tion of rest, the full cycle stopping mechanism will operate (when the machine is started) to prevent the numeral wheel actuators from pasing out of the zone of idle movement, provided in reversible cycle machines to accommodate the tens transfer devices. be further noted that, under these conditions, arm 24 may be utilized to transmit the shifting impulse in the manner to be described.

As fully set forth in the above-mentioned Patent 1,566,650, the release of the add or subtract keys, after depression thereof, and subsequent to operation of the machine has caused a tripping of trigger 31 allowing stop member 25 by means of its spring 26 to be moved into position for engagement with the free end 27 of rock lever 22. Rock lever 22 having suitable connection with the differential actuating mechanism and. oscillated thereby about point 23 will now carry arm 24 It will.

of the-stop mechanism from normal position to position of contact with the stop member 29, as fully described in'the aforesaid Chase patent.

Pivotally mounted at 48 on arm 24 is a push rod 47 the forward end of said push rod being adapted to push forwardly against roller 51 mounted on abell lever 52 fulcrumed at 53 to the framing.

During movement of arm 24 toward stop 29 forward end of push rod 47 is held against roller 51 of belllever 52, when the division key is in forward or inactive position, by meansof a suitably arranged lever 331 also fulcrumed at 53 and adapted to rock with bell lever 52 by means of pin 332.

This arrangement of lever 331 is essential to the construction shown, because push rod 47 is capable of a selective operation, when the automatic division lever 218 is in use, in which the end of said rod is held against roller 51 at the end of an additive operation only whereas, according to the present invention, a shift of carriage 2 may follow the release of the subtract key, as well as the release of the add key, and the push rod must accordingly operate the bell lever upon every movement of arm 28.

The forward end of bell lever 52 is connected with one arm of carriage shifting lever 55 (Fig. 6) by means of spring 57 and spacer rod 54. The other end of carriage shifting lever 55 is provided with a roller 58, adapted to operate against the right and left carriage shifting cams 59 and 60 loosely mounted on carriage shifting shaft 46 each having the toothed hub clutch members 61 adapted for engagement with the com lementary opposite clutch members 62 an 63 fast upon shaft 46.

When, therefore, clutch members'61 and 62 are in engagement, movement of arm 24, during a stopping operation following release of the add or subtract key, will cause push rod 47 to operate bell lever 52 to tension spring 57. Spring 57 in its elongation stores energy and utilizes the same more slowly in its operation of the carriage shifting lever 55.

As roller 58 of the carriage shifting lever is carried upward, cam 59 and consequently carriage shifting shaft 46 are rotated clockwise about ninety degrees, as viewed in Fig. 6, thereby raising and advancing the carriage 2, by means of a roller 64 engaging a serration of the rack on the front edge of the carriage, the momentum of the carriage and force of gravity being suflicient to complete the shift thereof. 7

To effect a left-hand shift of the numeral wheel carriage, knob 324 is turned toward the left, as indicated in Fig. 5, whereupon pin 326, acting in slot 327, will cam lever 321 clockwise about point 322 until latched by click 323 entering the left-hand notch of lever 321. During the movement of lever 321 about point 322, pin'330 fast to lever 321 will contact with and rock pawl 318 clockwise about point 319, away from plate 65, to allow said plate 65 to be drawn rearwardly by action of spring 316, whereupon the shipper arm 317 will act to bring clutch member 61 into engagement with the clutch member 63, fast to the carriage shifting shaft 46. In this position of the parts, under the power impulse above described, roller 58 of the carriage shifting lever 55 (Fig. 6) acting on cam 60 will rotate the said carriage shifting shaft in a counter-clockwise direction to shift the numeral wheel carriage one space toward the left in the manner previously described.

Upon the return of arm 24 from the stop 29 and the subsequent return to normal of the various parts used to transmit the'shifting impulse, carriage shifting cams 59 and 60 are returned to normal by the respective springs 333 and 334. (Figs. 3, 4, 5 and 6).

In performing automatic division by manipulation of the division lever 218, it is desired to set the left-hand shift cams 61, 63 in active position as the division lever is pushed rearward and to return the shiftin cams automatically to their original setting, as indicated by the arrow on knob 324, at the conclusion of the division operation.

For this purpose, lever 301 is mounted on a slide bar 217, held in the position illustrated in the drawings by contact with a pin on the division lever. As the division lever is moved rearward, slide bar 217 is allowed to move rearward also, under spring pressure, carrying with it lever 301 and pawl 318. The pawl 318, in moving rearward between pins 320 and 330, will straighten out if member 321 has been moved to throw it at an angle and will assume a position allowing shifting clutch member 61 to engage clutch member 63.

Upon return of the division lever 218 to forward position, slide bar 217 and lever 301 will be forced thereby into their normal positions, and pawl 318 will assumethe position indicated by the setting of knob 324.

I claim:

1. Automatic carriage-shifting means for calculating machines having a carriage-shifting train, a direction control element interposed in said train, and means operable to impart a shifting impulse at the conclusion of a registering operation; com rising presetting means including a mem er engaging said element, manually settable selectively to one of three positions and adapted in the one or the other active position to determine the transmission of said impulse and the shifting of the carriage in one or in the other direction respectively.

2. Automatic carriage-shifting means for calculating machines having a carriage-shift ing train, a direction control element interposed in said train, and means operable to impart a shifting impulse at the conclusion of a registering operation; comprising presetting means including a member engaging said element, manually settable selectively to one of three positions and adapted in the one or the other active position to determine the transmission of said impulse and the shifting of the carriage in one or in the other direction respectively said presetting means including a normally stationary member displaceable to allow independent setting of the direction control element.

Signed at Orange, in the count of Essex. and. State of New Jersey this 1 th day of December, A. D. 1929.

EDWIN F. BRITTEN, JR. 

